Stylus for sound-reproducing machines.



v. TZZ.

S-I'V FR SOUND HEFRODUCWG MCHH-S.

PFLICATlON FILED 0CT.19|1916.

Patented NM2 l2. 12H8.

serieus ron. sourinnnrnonuoino iii-sourires.

Application filed otoiier it), Mio.

To all whom t may conce-rn:

Be it known that l, ANGELO M. Tozzi, a subject of the King of italy, and resident of Bayonne, in the county of Hudson and State ont New Jersey, have invented certain new and useful Improvements in Styli for Sound-Reproducing Machines, of which the following is a specification.

This invention relates to a stylus for sound reproducing machines; my object being to provi "e a hard durable stylus whereby tone quality is preserved and whereby Wide variability of tone volume may be attained.

Accordingly my invention, generaliy stated, comprises a. stylus composed oi a stem or tang merging with a tapering concavoconvex portion terminating in a. track point.

The invention also comprises Jieatures of construction .which will be hereinafter described and claimed. f

in the annexed drawings# Figure i is a side elevation of a stylus enibodying the preferred iorrn of my invention, thev device being illustrated as associatedwith a sound box and in playing position upon a record.

F ig. 2 is o transverse section through the stem or tang of the stylus, as on lthe line Q m52. oi: Fig. i.

Fig. 3 is a similar section through the concavo-convex extension, as on the line 3-3 ofiiig. l.

Figs. 4f, and are elevations of the stylus, on iarger scaie, showing it in dierent playing positions in. order to vary the tone volume.

Referring to the drawings, A designates a sound box of any usual or approved conf n d against the record and thus effect a unid rem struction; B my improved stylus as applie thereto, and C a part of a record with the track of which the stylus is engaged.

The stylus, in' the typical form illustrated,

comprises a tubular' si em or tang l0 having a sectional extension 11 longitudinally thereof terminating in a point 12, the whole being composedv orfa a single piece of sheet metal apprcpriately shaped, hardened, ground and polished. The extension is concave-couver,r in cross-section throughout the greater part of its length, its longitudinal tapering edges resenting. compound curves which diverge graduallyffrom the point toward and merge with the body of the stern as illustrated. Thev bulged portions 18 of the edges of the extension. augment the transversestrengtn of the iatter in e plane between the point and the- .,pecieaton of Letters Patent.

drical needle, which is necessarily made relatively soft to avoid iiability of breaking the point, (and thus rapidly abraded by frictionai Contact with the record) can be used for a brief period only.

Apart from this important feature of duo rability, iny improved stylus insures tone quality and perinits numerous changes in tone volume in the operation of a sound reproducing machine.

Tone ouaiit;Y results the pecuiiar cor.

' tour of the sectionai extension or the tubuiar stein whereby 'the artis of vibration of the point is largely ioeaiised lower portion we es are to the Eibiasting is obviated;

of the entende unitorinly tubular stein..

,n sou d acting as e. shockabsorber, eliminates shriii or strident tones.

Variations in tone or, in other voisine can be. readily effected ioy changing the po of the stylus relation to the path c ...e record; that is to say, if the stylus positioned as in Fig. l, with the concave side ci the extension downward, the point Wili bear resilientiy production similarly to a soit needle; if the stylus be positioned with the concave portion upward. as in Fig. 4 the point Wili bear more rigidly against therecord and effect a sharp reproduction similarly to a hardl7 needle. and if the stylus be positioned with its concave portion presented outwardly as in Fig. 5, or inwardly as in Fig. 6 the bearing action of the needle in each case will be modified to produce re `specrively intermediate tone volumes. And

similarly. by 'adjusting the stylus to vary the position ot the point about the longitudinal axis of the stylus, amultipiicity of changes in tone volume can be eiieiently produced, as occasion may require.

It is to be understood that the details ci ffii Sii

lim

gwn

"eple of my construction may be Varied within the prininvention. and the scope of the appended claims.

l. A stylus of the character described comprising a Stem having a tapering concave-convex extension terminating; in a track point,v the edgesof such portion presenting compound curves the bulges of which augment the strength of the extension in a plane between the point and the root of the eXtension, whereby the axis of vibration of the point is largely localizedbelcw said bulges.

2. A stylus of the character described comprising a tubular stem having atapering concave-convex extension terminating in a track point, the edges of such portion' presenting compound curves the bulges of which augment the strength of the extension in a plane between the point and the root of the extension, whereby the axis of vibration of the point is largely localized below said bul es.

.Sggned at N eu? York,4 in the county and State of New York, this 18th day of October, A.. D. 1916. Y.

ANGELO M. TOZZI. 

